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Mortgage Servicing - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Transfers and Servicing [Abstract]      
Portfolio of loans acquired | loan 50,421    
UPB of loans acquired $ 11,900.0    
Portfolio of loans sold | loan 435    
UPB of MSRs sold $ 116.1    
Float balances $ 2,100.0 $ 1,700.0 $ 1,700.0